Transistor Metallization Endcaps With Unaligned Gate-Contact Overlap
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Solution Overview
Problem
Existing technologies fail to effectively address the performance limitations of integrated circuits (ICs) with tightly constrained contact structures, leading to reduced opportunities for process performance improvements.
Innovation Solution
Implementing unaligned endcaps for transistor metallization structures, which are initially fabricated with unaligned ends and then trimmed to achieve desired dimensions, reducing parasitic capacitances and optimizing transistor performance by adjusting gate and contact lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transistor dimensions are scaled down to increase device density, then device density increases, but parasitic capacitances increase and performance deteriorates
Solution Approach 1:
The patent applies asymmetry by intentionally misaligning the endcaps of gate electrodes and source/drain contacts. Instead of maintaining symmetric alignment, the endcaps are positioned at different longitudinal locations, creating an asymmetric configuration that reduces the overlapping area between gate and contact structures, thereby reducing parasitic capacitance while maintaining compact device dimensions for high density.
Solution Approach 2:
The patent addresses the parasitic capacitance issue by transitioning from a two-dimensional alignment problem to a three-dimensional solution. By controlling the longitudinal positions of endcaps independently from the transverse alignment, the patent creates additional design freedom in the longitudinal dimension to reduce overlap area and parasitic capacitance without compromising device density.
2Object-generated harmful factors
If gate and contact dimensions are reduced to improve performance, then parasitic capacitance decreases, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the gate electrode and source/drain contact structures into independent elements with independently controllable dimensions and positions. By treating the gate endcap and contact endcap as separate, independently adjustable components, the patent enables precise control over their relative positioning and overlapping area, thereby reducing parasitic capacitance while maintaining manufacturability through independent process control.
3Ease of manufacture
If aligned endcaps are used for simplicity, then manufacturing is easier, but parasitic capacitance increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the longitudinal positions of gate endcaps and source/drain contact endcaps during the patterning and deposition processes. Instead of relying on final alignment steps, the endcap positions are established in advance through controlled deposition and etching processes, enabling the asymmetric configuration to be achieved with standard manufacturing techniques while reducing parasitic capacitance.
Data Source
AI summary
Integrated circuit (IC) devices having transistors with electrodes and/or contacts in close proximity. An IC device includes a transistor structure having a channel between a source and a drain, a gate electrode over the channel region, and contacts on the source and the drain, and the electrode and contacts extend past an edge or sidewall of the channel different distances, that is, with unaligned ends. One or both of the source and drain contacts may extend past the gate electrode. The gate electrode may extend past one or both of the source and drain contacts. The source and drain contacts and the gate electrode may be formed to unaligned dimensions or may be disaligned by trimming.